I finally got the power draw bar working and I got the spindle going so it's nice to know it isn't in the condition the power draw bar was, lol.
The spindle is a 3 phase multi-voltage motor. I'm running it on 3 phase 230V provided by a variable frequency drive. I used a 4 wire cord to bring line 1, line 2, neutral, and ground to the machine. That goes to a 30 amp breaker I put in the relay cabinet. I haven't moved the 115 stuff over to that yet but I'm going to; that's why I used the 4 wire cord and brought neutral over in it. From there I used a 3 wire cord to bring line 1, line 2, and ground up to a tyco corcom 20 amp emc filter which I mounted to the back of the aluminum bracket the vfd is mounted on. I mounted that bracket to the bracket that the old reversing switch was mounted to. From the EMC filter line 1 and line 2 provide single phase 230 to the vfd. The vfd grounds through the back plate. The vfd provides 3 phase 230 to the spindle motor. Since it's being run with 230V the spindle motor is wired phase 3 to ( 1&7 ), phase 2 to ( 2&8 ), phase 1 to ( 3&9 ), and ( 4,5,&6 ) tied together.
![](http://ecutune.com/mill/DSC_5634.jpg)
![](http://ecutune.com/mill/DSC_5636.jpg)
The power drawbar while kind of cool was a mess electronically. It uses an electric impact wrench for the turning and a pneumatic cyllinder to bring the impact wrench and drawbar socket down onto the drawbar. It uses a 115v air solenoid to actuate the cyllinder to bring it down onto the drawbar. The coil on the solenoid was bad. It uses a relay to switch poles for forward and reverse and has some electronics to enable an adjustable delay between when the solenoid is activated bringing the socket down onto the nut and when the impact wrench starts going as well as adjusting the speed difference in the impact wrench between tool in and tool out. This makes it work beautifully when it works and suitable for automatic tool changing but it needed a little diagnosis to get it going. I started by replacing the electrolytic caps just because they are 30 years old and are electrolytic caps. I noticed a bad transistor and replaced that as well. I plugged it in to test it out and as soon as it got power it ran wild (and began blowing the new transistor). At that point I had to figure out how the thing worked. Since it's part of the summitt dana bandit gear and not actually manufactured by spindle wizard I don't have the luxury of the schematics for this part but it wasn't impossibly complex. I found the diode going from the transistor that was melting had 20 ohms resistance instead of no continutity and needed to be replaced. Then I found the scr had less than an ohm resistance instead of no contiunity and needed to be replaced. Now it works beautifully.
![](http://ecutune.com/mill/DSC_5639.jpg)
![](http://ecutune.com/mill/DSC_5642.jpg)
Able to reinstall a tool holder and ready to run the spindle I did just that and did some testing and adjusting of the varispeed so that the indicator which I removed when I took the varispeed housing apart was set back to the correct place.